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Unit Standard (JSR 363) Reference Implementation.
There is a newer version: 1.0.3
/*
 *  Unit-API - Units of Measurement API for Java
 *  Copyright (c) 2005-2015, Jean-Marie Dautelle, Werner Keil, V2COM.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of JSR-363 nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package tec.units.ri.quantity;

import javax.measure.Quantity;
import javax.measure.Unit;

import tec.units.ri.AbstractQuantity;

/**
 * An amount of quantity, consisting of a double and a Unit. IntegerQuantity
 * objects are immutable.
 * 
 * @see AbstractQuantity
 * @see Quantity
 * @author Werner Keil
 * @author Otavio de Santana
 * @param 
 *            The type of the quantity.
 * @version 0.3, $Date: 2015-07-07 $
 */
final class IntegerQuantity> extends AbstractQuantity {

	final int value;

	public IntegerQuantity(int value, Unit unit) {
		super(unit);
		this.value = value;
	}

	@Override
	public Integer getValue() {
		return value;
	}

	public double doubleValue(Unit unit) {
		return (super.getUnit().equals(unit)) ? value : super.getUnit()
				.getConverterTo(unit).convert(value);
	}

	@Override
	public long longValue(Unit unit) {
		double result = doubleValue(unit);
		if ((result < Long.MIN_VALUE) || (result > Long.MAX_VALUE)) {
			throw new ArithmeticException("Overflow (" + result + ")");
		}
		return (long) result;
	}

	@Override
	public Quantity add(Quantity that) {
		final Quantity converted = that.to(getUnit());
		return NumberQuantity.of(value + converted.getValue().intValue(), getUnit());
	}

	@Override
	public Quantity subtract(Quantity that) {
		final Quantity converted = that.to(getUnit());
		return NumberQuantity.of(value - converted.getValue().intValue(), getUnit());
	}

	@SuppressWarnings({ "rawtypes", "unchecked" })
	@Override
	public Quantity multiply(Quantity that) {
		return new IntegerQuantity(value * that.getValue().intValue(), 
				getUnit().multiply(that.getUnit()));
	}

	@Override
	public Quantity multiply(Number that) {
		return NumberQuantity.of(value * that.intValue(), getUnit());
	}

	@Override
	public Quantity divide(Quantity that) {
		return NumberQuantity.of((double) value / that.getValue().doubleValue(), 
				getUnit().divide(that.getUnit()));
	}

	@SuppressWarnings("unchecked")
	@Override
	public AbstractQuantity inverse() {
		return (AbstractQuantity) NumberQuantity.of(1 / value, getUnit().inverse());
	}

	@Override
	public Quantity divide(Number that) {
		return NumberQuantity.of(value / that.doubleValue(), getUnit());
	}

}